From ad241528c4919505afccb022acbab3eeb0db4d80 Mon Sep 17 00:00:00 2001
From: Jan Nikitenko <jan.nikitenko@gmail.com>
Date: Tue, 17 Jul 2007 04:04:03 -0700
Subject: CRC7 support

Add CRC7 routines, used for example in MMC over SPI communication.
Kerneldoc updates

[akpm@linux-foundation.org: fix funny mix of const and non-const]
Signed-off-by: Jan Nikitenko <jan.nikitenko@gmail.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 include/linux/crc7.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 include/linux/crc7.h

(limited to 'include/linux/crc7.h')

diff --git a/include/linux/crc7.h b/include/linux/crc7.h
new file mode 100644
index 000000000000..1786e772d5c6
--- /dev/null
+++ b/include/linux/crc7.h
@@ -0,0 +1,14 @@
+#ifndef _LINUX_CRC7_H
+#define _LINUX_CRC7_H
+#include <linux/types.h>
+
+extern const u8 crc7_syndrome_table[256];
+
+static inline u8 crc7_byte(u8 crc, u8 data)
+{
+	return crc7_syndrome_table[(crc << 1) ^ data];
+}
+
+extern u8 crc7(u8 crc, const u8 *buffer, size_t len);
+
+#endif
-- 
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